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A093401 Primes of the form 20*R_n + 9, where R_n is the repunit (A002275) of length n. 1
29, 229, 22229, 22222222222229 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

a(5) has 176 digits [From Vincenzo Librandi, Dec 10 2010]

CROSSREFS

Cf. A056678 (corresponding n).

Sequence in context: A142066 A091631 A146421 * A042636 A091630 A027112

Adjacent sequences:  A093398 A093399 A093400 * A093402 A093403 A093404

KEYWORD

nonn

AUTHOR

Rick L. Shepherd (rshepherd2(AT)hotmail.com), Mar 28 2004

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Last modified February 17 13:28 EST 2012. Contains 206031 sequences.